use master
DECLARE @sessionId INT;
DECLARE kill_cursor CURSOR FOR
SELECT session_id
FROM sys.dm_exec_sessions
WHERE database_id=DB_ID('DBName');
OPEN kill_cursor;
FETCH NEXT FROM kill_cursor INTO @sessionId;
WHILE @@FETCH_STATUS=0
BEGIN
PRINT 'Killing session:'+CAST(@sessionId AS VARCHAR(10));
EXEC('KILL '+@sessionId);
FETCH NEXT FROM kill_cursor INTO @sessionId;
END
CLOSE kill_cursor;
DEALLOCATE kill_cursor;